What’s Vulnerable › Vulnerabilities

CVE-2020-8155

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-12 · updated 2026-06-17
• Weakness: CWE-79

Description

An outdated 3rd party library in the Files PDF viewer for Nextcloud Server 18.0.2 caused a Cross-site scripting vulnerability when opening a malicious PDF.

Affected products

• Nextcloud Server: before 18.0.3 — fixed in 18.0.3

How to fix

Upgrade to a fixed version: Nextcloud Server 18.0.3. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00037.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00038.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00040.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-019
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00037.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00038.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00040.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-019

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